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  <h1>Source code for django.views.decorators.csrf</h1><div class="highlight"><pre>
<span></span><span class="kn">from</span> <span class="nn">functools</span> <span class="k">import</span> <span class="n">wraps</span>

<span class="kn">from</span> <span class="nn">django.middleware.csrf</span> <span class="k">import</span> <span class="n">CsrfViewMiddleware</span><span class="p">,</span> <span class="n">get_token</span>
<span class="kn">from</span> <span class="nn">django.utils.decorators</span> <span class="k">import</span> <span class="n">decorator_from_middleware</span>

<span class="n">csrf_protect</span> <span class="o">=</span> <span class="n">decorator_from_middleware</span><span class="p">(</span><span class="n">CsrfViewMiddleware</span><span class="p">)</span>
<span class="n">csrf_protect</span><span class="o">.</span><span class="vm">__name__</span> <span class="o">=</span> <span class="s2">&quot;csrf_protect&quot;</span>
<span class="n">csrf_protect</span><span class="o">.</span><span class="vm">__doc__</span> <span class="o">=</span> <span class="s2">&quot;&quot;&quot;</span>
<span class="s2">This decorator adds CSRF protection in exactly the same way as</span>
<span class="s2">CsrfViewMiddleware, but it can be used on a per view basis.  Using both, or</span>
<span class="s2">using the decorator multiple times, is harmless and efficient.</span>
<span class="s2">&quot;&quot;&quot;</span>


<span class="k">class</span> <span class="nc">_EnsureCsrfToken</span><span class="p">(</span><span class="n">CsrfViewMiddleware</span><span class="p">):</span>
    <span class="c1"># We need this to behave just like the CsrfViewMiddleware, but not reject</span>
    <span class="c1"># requests or log warnings.</span>
    <span class="k">def</span> <span class="nf">_reject</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">request</span><span class="p">,</span> <span class="n">reason</span><span class="p">):</span>
        <span class="k">return</span> <span class="kc">None</span>


<span class="n">requires_csrf_token</span> <span class="o">=</span> <span class="n">decorator_from_middleware</span><span class="p">(</span><span class="n">_EnsureCsrfToken</span><span class="p">)</span>
<span class="n">requires_csrf_token</span><span class="o">.</span><span class="vm">__name__</span> <span class="o">=</span> <span class="s1">&#39;requires_csrf_token&#39;</span>
<span class="n">requires_csrf_token</span><span class="o">.</span><span class="vm">__doc__</span> <span class="o">=</span> <span class="s2">&quot;&quot;&quot;</span>
<span class="s2">Use this decorator on views that need a correct csrf_token available to</span>
<span class="s2">RequestContext, but without the CSRF protection that csrf_protect</span>
<span class="s2">enforces.</span>
<span class="s2">&quot;&quot;&quot;</span>


<span class="k">class</span> <span class="nc">_EnsureCsrfCookie</span><span class="p">(</span><span class="n">CsrfViewMiddleware</span><span class="p">):</span>
    <span class="k">def</span> <span class="nf">_reject</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">request</span><span class="p">,</span> <span class="n">reason</span><span class="p">):</span>
        <span class="k">return</span> <span class="kc">None</span>

    <span class="k">def</span> <span class="nf">process_view</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">request</span><span class="p">,</span> <span class="n">callback</span><span class="p">,</span> <span class="n">callback_args</span><span class="p">,</span> <span class="n">callback_kwargs</span><span class="p">):</span>
        <span class="n">retval</span> <span class="o">=</span> <span class="nb">super</span><span class="p">()</span><span class="o">.</span><span class="n">process_view</span><span class="p">(</span><span class="n">request</span><span class="p">,</span> <span class="n">callback</span><span class="p">,</span> <span class="n">callback_args</span><span class="p">,</span> <span class="n">callback_kwargs</span><span class="p">)</span>
        <span class="c1"># Forces process_response to send the cookie</span>
        <span class="n">get_token</span><span class="p">(</span><span class="n">request</span><span class="p">)</span>
        <span class="k">return</span> <span class="n">retval</span>


<span class="n">ensure_csrf_cookie</span> <span class="o">=</span> <span class="n">decorator_from_middleware</span><span class="p">(</span><span class="n">_EnsureCsrfCookie</span><span class="p">)</span>
<span class="n">ensure_csrf_cookie</span><span class="o">.</span><span class="vm">__name__</span> <span class="o">=</span> <span class="s1">&#39;ensure_csrf_cookie&#39;</span>
<span class="n">ensure_csrf_cookie</span><span class="o">.</span><span class="vm">__doc__</span> <span class="o">=</span> <span class="s2">&quot;&quot;&quot;</span>
<span class="s2">Use this decorator to ensure that a view sets a CSRF cookie, whether or not it</span>
<span class="s2">uses the csrf_token template tag, or the CsrfViewMiddleware is used.</span>
<span class="s2">&quot;&quot;&quot;</span>


<div class="viewcode-block" id="csrf_exempt"><a class="viewcode-back" href="../../../../ref/csrf.html#django.views.decorators.csrf.csrf_exempt">[docs]</a><span class="k">def</span> <span class="nf">csrf_exempt</span><span class="p">(</span><span class="n">view_func</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot;</span>
<span class="sd">    Marks a view function as being exempt from the CSRF view protection.</span>
<span class="sd">    &quot;&quot;&quot;</span>
    <span class="c1"># We could just do view_func.csrf_exempt = True, but decorators</span>
    <span class="c1"># are nicer if they don&#39;t have side-effects, so we return a new</span>
    <span class="c1"># function.</span>
    <span class="k">def</span> <span class="nf">wrapped_view</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
        <span class="k">return</span> <span class="n">view_func</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span>
    <span class="n">wrapped_view</span><span class="o">.</span><span class="n">csrf_exempt</span> <span class="o">=</span> <span class="kc">True</span>
    <span class="k">return</span> <span class="n">wraps</span><span class="p">(</span><span class="n">view_func</span><span class="p">)(</span><span class="n">wrapped_view</span><span class="p">)</span></div>
</pre></div>

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